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Abstract Gamma-ray bursts (GRBs) are flashes of high-energy radiation arising from energetic cosmic explosions. Bursts of long (greater than two seconds) duration are produced by the core-collapse of massive stars1, and those of short (less than two seconds) duration by the merger of compact objects, such as two neutron stars2. A third class of events with hybrid high-energy properties was identified3, but never conclusively linked to a stellar progenitor.
Chandra observed the counterpart of GW170817 at four different epochs. The first observation, performed at T + 2.2 d, did not detect X-ray emission from AT 2017gfo (ref. 31). Our observations (Principal Investigator (PI): E. Troja) were performed at T + 9 d and T + 15 d for total exposures of 50?ks and 47?ks, respectively. Data were reduced and analysed using standard analysis tools within CIAO v. 4.9 with calibration database CALDB v.
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